Add clang volatile fixes from FreeBSD and NetBSD.

Use volatile instead of optnone to avoid optimization which causes
segmentation faults.
Patch by Dimitry Andric.  [ruby-core:78531] [Bug #13014]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57020 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 4 deletions

diff --git a/vm_eval.c b/vm_eval.c
index f0274e1b9a..c08a849e59 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -1280,7 +1280,7 @@ eval_string_with_cref(VALUE self, VALUE src, VALUE scope, rb_cref_t *const cref_
 {
     int state;
     VALUE result = Qundef;
-    rb_thread_t *th = GET_THREAD();
+    rb_thread_t *volatile th = GET_THREAD();
     struct rb_block block;
     const struct rb_block *base_block;
     volatile VALUE file;
@@ -1997,7 +1997,7 @@ rb_catch(const char *tag, VALUE (*func)(), VALUE data)
     return rb_catch_obj(vtag, func, data);
 }
 
-static VALUE vm_catch_protect(VALUE, rb_block_call_func *, VALUE, int *, rb_thread_t *);
+static VALUE vm_catch_protect(VALUE, rb_block_call_func *, VALUE, int *, rb_thread_t *volatile);
 
 VALUE
 rb_catch_obj(VALUE t, VALUE (*func)(), VALUE data)
@@ -2018,11 +2018,11 @@ rb_catch_protect(VALUE t, rb_block_call_func *func, VALUE data, int *stateptr)
 
 static VALUE
 vm_catch_protect(VALUE tag, rb_block_call_func *func, VALUE data,
-		 int *stateptr, rb_thread_t *th)
+		 int *stateptr, rb_thread_t *volatile th)
 {
     int state;
     VALUE val = Qnil;		/* OK */
-    rb_control_frame_t *saved_cfp = th->cfp;
+    rb_control_frame_t *volatile saved_cfp = th->cfp;
 
     TH_PUSH_TAG(th);